This model was designed to guide the air flow towards the print for printing with PLA filaments. The channel opening was designed to minimize the reflecting air flow from the duct wall. The model is used in the Artifex 3D Printer (http://www.3dmakerworld.com/artifex), and can be used in other printers with modification. Installation instruction is provided in the Artifex Build Instruction: http://www.3dmakerworld.com/support/documents. The model was designed in Alibre (now Geomagic), and the source files can be found here: https://github.com/3dmakerworld/artifex.